Can Airborne Allergens be Deadly?

According to the Asthma and Allergy Foundation of America, asthma is characterized by inflammation of the air passages resulting in the temporary narrowing of the airways that transport air from the nose and mouth to the lungs. Asthma symptoms can be caused by allergens or irritants that are inhaled into the lungs, resulting in inflamed, clogged, and constricted airways. Symptoms include difficulty breathing, wheezing, coughing, and tightness in the chest. In severe cases, asthma can be deadly.